Wordpress post query php自定义字段条件

情况如下：

在wordpress中，我试图重置一个post WP_查询，以便根据post中是否存在自定义字段重写post链接。我试图在自定义字段中为帖子添加一个新链接

我在这里所做的就是完全删除链接。非常感谢您的任何帮助，我对php非常熟悉

以下是我的WP_查询：

  <?php
                     $recentPosts = new WP_Query();
   $recentPosts->query('showposts=3');
  ?>

                    <?php while ($recentPosts->have_posts()) : $recentPosts->the_post(); ?>

                     <div <?php post_class() ?> id="post-<?php the_ID(); ?>">
   <?php
    $attribute = the_title_attribute();
    $title = the_title();
    $key = 'NewPostLink';
    $newLink = get_post_meta( $post->ID, $key, TRUE );
    if ($newLink != '') {
     $theLink = get_permalink ($post->ID );
     if (has_post_thumbnail()) {
      $image = get_the_post_thumbnail( $post->ID );
      echo '<div class="thumbnailbox"><div class="thumbnail"><a href="'.$theLink.'">'.$image.'</a></div></div>';
      echo '<h2><a href="'.$theLink.'" rel="bookmark" title="Permanent Link to '.$attribute.'">'.$title.'</a></h2>';
     } else {
      echo '<h2><a href="'.$theLink.'" rel="bookmark" title="Permanent Link to '.$attribute.'">'.$title.'</a></h2>';
     }
    } else {
     $theLink = $newLink;
     if (has_post_thumbnail()) {
      $image = get_the_post_thumbnail( $post->ID );
      echo '<div class="thumbnailbox"><div class="thumbnail"><a href="'.$theLink.'">'.$image.'</a></div></div>';
      echo '<h2><a href="'.$theLink.'" rel="bookmark" title="Permanent Link to '.$attribute.'">'.$title.'</a></h2>';
     } else {
      echo '<h2><a href="'.$theLink.'" rel="bookmark" title="Permanent Link to '.$attribute.'">'.$title.'</a></h2>';
     }
    }
   ?>
                     <small><?php the_time('F jS, Y') ?></small>

                      <div class="entry">
                      <?php the_excerpt(); ?>
                     </div>

                     </div>

                     <?php endwhile; ?>

---

我想这就是你需要的。很难说。我假设if语句的第一部分是在没有自定义post-meta的情况下运行的语句？我不知道。这就是问题所在。如果自定义post meta返回值，if语句将运行第一部分，否则将使用空字符串作为href运行第二部分。如果自定义值不存在或不是空字符串，则运行第一部分。将if语句更改为检查它是否为空更好，因为如果它不存在，它将捕获它，并返回false，或者如果它确实存在，但是声明但未定义的空字符串，则将捕获它

我只用一行注释标记了我编辑的内容

    <?php
                         $recentPosts = new WP_Query();
       $recentPosts->query('showposts=3');
      ?>

                        <?php while ($recentPosts->have_posts()) : $recentPosts->the_post(); ?>

                         <div <?php post_class() ?> id="post-<?php the_ID(); ?>">
       <?php
        $attribute = the_title_attribute();
        $title = the_title();
        $key = 'NewPostLink';
        $newLink = get_post_meta( $post->ID, $key, TRUE );
/* EDITED */        if (empty($newLink)) {
         $theLink = get_permalink ($post->ID );
         if (has_post_thumbnail()) {
          $image = get_the_post_thumbnail( $post->ID );
          echo '<div class="thumbnailbox"><div class="thumbnail"><a href="'.$theLink.'">'.$image.'</a></div></div>';
          echo '<h2><a href="'.$theLink.'" rel="bookmark" title="Permanent Link to '.$attribute.'">'.$title.'</a></h2>';
         } else {
          echo '<h2><a href="'.$theLink.'" rel="bookmark" title="Permanent Link to '.$attribute.'">'.$title.'</a></h2>';
         }
        } else {
         $theLink = $newLink;
         if (has_post_thumbnail()) {
          $image = get_the_post_thumbnail( $post->ID );
          echo '<div class="thumbnailbox"><div class="thumbnail"><a href="'.$theLink.'">'.$image.'</a></div></div>';
          echo '<h2><a href="'.$theLink.'" rel="bookmark" title="Permanent Link to '.$attribute.'">'.$title.'</a></h2>';
         } else {
          echo '<h2><a href="'.$theLink.'" rel="bookmark" title="Permanent Link to '.$attribute.'">'.$title.'</a></h2>';
         }
        }
       ?>
                         <small><?php the_time('F jS, Y') ?></small>

                          <div class="entry">
                          <?php the_excerpt(); ?>
                         </div>

                         </div>

                         <?php endwhile; ?>